I know this isn’t what you want to hear, but the majority of social workers seem to be like this.
There are good and bad in every profession - as a social worker I think I tend to be pretty balanced about the bad but your post does no justice to the vast majority of SWs working in child protection (which is the context your child’s social worker is likely to be working).
Your have two children who are your sole focus and, if you’re like me, their needs and concerns take a huge amount of your time and attention. Your child’s SW will have around 30 children all with very high levels of need and risk, along with a process where they have one hand tied behind their back most of the time and their every decision is scrutinised and criticised by a public who have no idea what the job actually entails. The reality is, the kids in care going through the adoption process are pretty much the safest kids on their workload, the ones they need to worry about least. And only one or two of the kids in their case load will be in that position, the rest will be in direct need of protection and support, usually bumping from crisis to crisis which - if the social worker makes the wrong decision - can realistically end in death.
No, it’s not ok for workers not to get back to you, and there’s no excuse for an adoption SW not to be honest about a prospective adopter not being booked in for panel but before you write off a whole profession maybe think about the reality of their job and consider there may be very good reason why you might not be top of their priority list.
I really sympathise with the struggles folk have with social workers - who at the end of the day are the human face of a long, relentless emotionally laden process. I don’t have much time for “most social workers are shit”, because I know differently. And yes, I know I’m almost inviting a hundred variations of “let me tell you how shit my SW was”, I’m not saying there aren’t problems in the system - SWs need to navigate the same problems.